java.lang.UnsatisfiedLinkError

I have a similar problem. I was able to compile and run my program from DOS command line. But any attempt to integrate the same code somewhere else is failing.

Please advice!

I have been getting java.lang.UnsatisfiedLinkError exception and now at loss what else should be done.

I build small sample program. Here are details:

1. Operation System: Windows XP

Sun JVM: j2sdk1.4.2_13

2. Base directory: C:\b\004

3. Native.java

public class Native

{

public native int returnValue();

public void getReturnValue()

{

int lRetVal = returnValue();

}

public static void main(String[] args)

{

System.loadLibrary("NativeJNI");

Native lNative = new Native();

lNative.getReturnValue();

}

}

4. I have Microsoft Visual Studio 2005 installed.

I use Visual Studio tool to open DOS command prompt.

At DOS command line, change directory to:C:\b\004

5. At DOS command line, issue the following commands.

Compile Java code:

javac Native.java

This creates Native.class file

Build C++ Header:

javah Native

This creates Native.h file.

6. The content of Native.h file is:

/* DO NOT EDIT THIS FILE - it is machine generated */

#include <jni.h>

/* Header for class Native */

#ifndef _Included_Native

#define _Included_Native

#ifdef __cplusplus

extern "C" {

#endif

/*

* Class:Native

* Method:returnValue

* Signature: ()I

*/

JNIEXPORT jint JNICALL Java_Native_returnValue

(JNIEnv *, jobject);

#ifdef __cplusplus

}

#endif

#endif

7. At c:\b\004 directory, I create Native.cpp file:

#include "Native.h"

#include <string.h>

JNIEXPORT jint JNICALL Java_Native_returnValue

(JNIEnv *, jobject)

{

return 5;

}

void main(){}

8. At DOS command line, I issue the following command:

(All at one line)

c:\b\004> cl -Ic:\j2sdk1.4.2_13\include -Ic:\j2sdk1.4.2_13\include\win32 -LD Native.cpp -FeNativeJNI.dll

This creates following files:

NativeJNI.dll

NativeJNI.lib

NativeJNI.exp

9. Now I need to make sure that DLL could be located by Java program. I placed DLL, LIB, and EXP files at C:\WINNT\system32 directory.

10. At DOS command line, I issue the following command:

c:\b\004> java Native

This program worked and I have got the following console output:

Returned Value: 5

11. So far everything worked.

Next, I have tried to use Eclipse.

I have created Eclipse project.

At Eclipse, the only change at Native.java that was introduced was a 損ackage?line:

package nk.jni.simple;

public class Native

{

public native int returnValue();

public void getReturnValue()

{

int lRetVal = returnValue();

}

public static void main(String[] args)

{

System.loadLibrary("NativeJNI");

Native lNative = new Native();

lNative.getReturnValue();

}

}

I complied and run the program.

Now, I have got the following exception:

java.lang.UnsatisfiedLinkError: returnValue

at nk.jni.simple.Native.returnValue(Native Method)

at nk.jni.simple.Native.getReturnValue(Native.java:15)

at nk.jni.simple.Native.main(Native.java:30)

Exception in thread "main"

What did I do wrong?

Peysocka at 2007-7-9 22:34:36 >